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Uninstall the generic driver from your computer first. (It's probable that you installed the OS driver which only runs the printer. If you leave this in place then you will confuse your computer.) Then disconnect the data cable before rebooting the machine. Now install the software from above.

A few days ago my HP Deskjet, 4100 Series, All In One printer just stopped working in the middle of printing. I got a new power cord/power pack and now the light comes on but there is no response when I try to print. It is as if the machine is not even turned on.

You can call hp tech support toll free number - 1-800-585-2494 and they will give you all information regarding to your printer. for more information you can visit: HP Customer service .
Hope this will help you better.

Check the power cable
Connect the HP Deskjet F4140 All-in-One directly to the walloutlet

Power Cycle:
Follow the steps below to power cycle your all-in-one:

1. Verify that the unit is switched on. Disconnect the USB/Ethernet cable from the All-in-One and also disconnect power cable from All-in-One and also from wall outlet.2. Wait 30 seconds.3. Plug in the power cable to All-in-One and also to wall outlet.
4. Check for the functionality

Reset the All-in-One:

1. Press and hold the Cancel button and then press the Start Copy Color button.
2. Release both buttons. The self-test page prints.